I’ve just come across this from “The Last Theorem” by Arthur C Clarke and Frederik Pohl (published shortly before Clarke’s death). It is a conversation between two characters Ranjit Subramanian and his wife Myra on tour presently in London discussing whether to visit New York:
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Uncertain whether to laugh or cry, Myra set down her glass. “Oh, my darling,” she said, “You’ve never been in America, have you?”
Suddenly worried, Ranjit turned to face her. “What do you mean?”
She reached out to stroke his hand. “Just that you haven’t noticed that they’re pretty old fashioned in some ways. The way they still use miles instead of kilometres, for instance. And – I hope this won’t upset you – the way they cling to the Fahrenheit thermometer scale instead of going to Celsius along with the rest of the world?”
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It seems that Clarke and Pohl were at least conscious of this issue even if they didn’t speak out about it otherwise.